/*标题的样式*/

h1.foremost_title {
    font-style: italic;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bold;
}


/*链接的样式*/

a.decoration_a:link {
    color: blue;
    text-decoration: none;
    background-color: antiquewhite;
}

a.decoration_a:visited {
    color: red;
    text-decoration: none;
    background-color: antiquewhite;
}

a.decoration_a:hover {
    color: purple;
    text-decoration: underline;
    background-color: antiquewhite;
}

a.decoration_a:active {
    color: pink;
    text-decoration: underline;
    background-color: antiquewhite;
}

a.decoration_a {
    font-size: 1.5em;
}


/*列表样式*/

ul.list {
    list-style-type: none;
    padding: 0px;
    margin: 0px;
    width: 100%;
}

ul.list li {
    background-image: url(俺妹.jpg);
    background-repeat: no-repeat;
    background-position: 0px 5px;
    padding-left: 1.5em;
}


/*导航栏*/

ul.bar {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
    height: 50px;
}

ul.bar li {
    float: left;
    width: 16.65%;
}

ul.bar li a {
    display: block;
    color: white;
    text-align: center;
    padding: 15px 10px;
    text-decoration: none;
    outline: none;
}

ul.bar li a:hover:not(.active) {
    background-color: #111;
}

ul.bar li a.active {
    background-color: #111;
}

div.bar {
    margin-left: 2%;
    margin-right: 2%;
    padding: 0;
    position: relative;
}


/*下拉菜单*/

ul.drop_bar {
    position: relative;
    width: 93%;
    height: 50px;
    background-color: #333;
    list-style-type: none;
    /*实现居中*/
    margin: auto;
    padding: 0;
    overflow: hidden;
}

ul.drop_bar li {
    width: 33.33%;
    float: left;
    margin: 0;
    overflow: hidden;
}

ul.drop_bar li a {
    /*让整个区域成为可点击的*/
    display: block;
    color: white;
    padding: 14px 10px;
    text-decoration: none;
    text-align: center;
    outline: none;
    transition-duration: 0.4s;
}

ul.drop_bar li a.active {
    background-color: #111;
}

ul.drop_bar li a:hover:not(.active) {
    background-color: #111;
}

div.drop_down {
    width: 33.33%;
    float: left;
    overflow: hidden;
    transition-duration: 0.4s;
}

div.drop_down:hover a#drop_menu {
    background-color: #111;
}

div.drop_down:hover div.drop_content {
    height: 200px;
}

div.drop_down a {
    display: block;
    text-align: center;
    text-decoration: none;
    color: white;
    background-color: #333;
    padding: 14px 10px;
    outline: none;
    transition-duration: 0.4s;
}

div.drop_content {
    position: relative;
    display: block;
    z-index: 2;
    clear: both;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.5);
    box-sizing: border-box;
    height: 0px;
    transition-duration: 0.7s;
}

div.drop_content a:hover {
    background-color: #111;
}

div.drop_bar::after {
    clear: both;
}


/*按钮*/

button.button_color {
    position: absolute;
    left: 45%;
    border-radius: 5px;
    background-color: #4caf50;
    font-size: 16px;
    text-align: center;
    padding: 14px 25px;
    color: white;
    cursor: pointer;
    outline: none;
    border: 1px solid rgba(0, 0, 0, 0);
    z-index: 1;
    transition-duration: 0.4s;
}

button.button_color:hover {
    border: 1px solid #4caf50;
    background-color: white;
    color: black;
}

button.button_shadow {
    position: absolute;
    left: 45%;
    background-color: #4caf50;
    font-size: 16px;
    border-radius: 5px;
    border: none;
    text-align: center;
    padding: 15px 32px;
    text-decoration: none;
    color: white;
    outline: none;
    cursor: pointer;
    z-index: 1;
    transition-duration: 0.4s;
}

button.button_shadow:hover {
    box-shadow: 1px 5px 10px 0px rgba(0, 0, 0, 0.5);
}


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